Method of forming can closures



July 5, 1932. 1.. HIRSCH ET AL METHOD'OF FORMING CAN CLOSURES Filed April 4, 1950 lNVENTORS ATTOR N EY$ drawing, in which sectional part of Fig. 1, showing a of the closure on an enlarged scale, before atbe paper,

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LEQNARD HIRSCH, 0F LYNDHURST, AND ED restate WIN A. YHARRISS, OF GRANGE, NEW JERSEY,

' ASSIGNORS TO B. B. DAVIS COMPANY, OF HOBOKEN, NEW JERSEY. A CORPORATION @F NEW JERSEY Application filed April 4, 1930. Serial No. 441,4e5.

This invention relates to a novel and im proved method of forming a metal closure for cans, and will be best understood from the following description and the annexed we have shown a selected way of practicing the invention and in which Fig. 1 is a view partly in elevation and partly in section showing the top of a can havingapplied thereto a closure made a cording to our novel method.

Fig. 2 is a section on the same plane as the a portion tachment to the can.

Figs. 3, 4, 5, 6, 7, 8 and 9 are views showing successive-steps to transform it into the closure.

Referring first to Fig. 1, we Have shown the invention as used in connection with a can 1 having a top designated generally at 2, and which is secured to the can at 3 by any suitable means such as a double seam. This top forms a closure for the can and is preferably provided with a central to receive the plug 5.

In the bottom of frangible sealing member 6'which may be made of any suitable material which can be easily cut with a knife, preferably without leaving'a ragged edge. This material may cardboard, cellophane, thin aluminum, or the like, it being understood that the top is of sheet metal or relatively non-frangible material.

Referring now to Figs. '3 to 9 inclusive, in Fig. 3 is shown a blank with which the method of forming the closure may start, this blank being in the form of a cup-shaped member having a flat bottom 7 surrounded by a cylindrical wall 8, this bottom and wall defining a recess. By the next operation, the bottom is depressed, as shown in Fig. 4, and the cylindrical wall 8 is made of smaller diameter, a flange 9 being formed at the same time.

By the next step, the flange is-formed with a gutter 10, as shown in Fig. 5, and by the following step the bottom 7 is brought to the position shown in Fig. 6, the wall 8 being folded back on itself to form an edge 11 in performed on a blank recess 4 adapted seallng member. Moreover, the constructlon the recess is disposed a the shape of a fold, it being noted that this edge is displaced from the bottom in a direction lengthwise of the wall 8.

The bottom 7 is then provided with an opening with its edge 12 folded downwardly, as seen in Fig. 7, and by the next step this edge is folded toward the wall to form the head 13. The sealing member 1 1 is then placed against the bead and the folded edge 11 is bent inwardly at the same time that the bead 13 is bent downwardly and outwardly toward the folded edge 11.

It will be seen that the as the folded edge 11, extend transversely to the plane of the sealing member, and that the sealing member is received within the space between these two elements, being bent twice in reverse directions, first around the bead 13 and then around the folded edge 11. By this arrangement the sealing member is clamped between two smooth elements overlapping one another, and while these elements lock the bent edge portion of the sealing member between them, nevertheless there is no ragged cut edge of metal to contact with the is one which may be easily'made by suitable dies, without the contact with the sealing member protected at all times from the dies. same time, her is cutfor removal, the bead being disposed transversely to the plane of the sealing member, and also being smooth at its exposed portion, it does not present any expose rough edge which might cause damage to the hands of a person opening the can. I The joint between the sealing member and the top may be'made still tighter by placing a suitable sealing compound in the space bewhich is At the bead 18, as well,

when the frangible sealing memdies at any time coming in tween the bead and thefolded edge, or by In any in which case ofcourse the contents will be permanently exposed or some other temporary closure provided therefor.

We claim 1. The method of manufacturing a can top which comprises drawing the top with a flat bottom connected to a peripheral wall, forcing said bottom upwardly by redrawing to form a close fold where the bottom is joined to the wall, cutting an opening in the bottom while leaving an inwardly extending annular portion adjacent the periphery thereof, placin a frangible sealing member on said annuFar peripheral portion, and bending said fold into engagement with the edge portion of the sealing member to clamp it against said remaining annular peripheral portion of the bottom.

2. The method of manufacturing a can top which comprises drawing the top with a flat bottom connected to a peripheral wall, forcing said bottom upwardly by redrawing to form a close fold where the bottom is joined to the wall, forming a recess in the bottom adottom while leaving an inwardly extending annular portion adjacent the periphery thereof, placing a frangible sealing member on said annular peripheral portion, bending said fold into engagement with the edge portion of the sealing member to clamp it against said remaining annular peripheral portion of the bottom, and to force it into said recess.

3. The method of manufacturing a can top which comprises drawing the top with a fiat bottom connected to a eripheral wall, forcing said bottom upwardly by' redrawing to form a close fold where the bottom is joined to the wall, forming a recess in the bottom adjacent the wall, cutting an opening in the bottom while leaving an inwardly extending annular portion adjacent the periphery thereof, placing a frangible sealing memher on said annular peripheral portion, bending said fold into engagement with the edge portion of the sealing member to clamp it against said remaining annular peripheral portion of the bottom and to force it into said recess, and filling said recess with a sealing compound;

4. The method of manufacturing a can top which comprises forming the top with a flat bottom connected to a peripheral Wall, forcing said bottom upwardly toform a fold where the bottom is joined to the wall, cutting an opening in the bottom and leaving an inwardly extending portion adjacent the edge thereof, folding back said edge portion to form a bead on the side next said fold, and bonding saidfold into engagement with the edge portion of the sealing member to clamp it between the fold and the head.

I 5. The method of manufacturing a can top which comprises forming the top with a flat bottom connected to a peripheral wall,

acent the wall, cutting an opening in the aseaaee forcing said bottom upwardly to form a fold where the bottom is joined to the wall, cutting an opening in the bottom and leaving an inwardly extending portion adjacent the edge thereof, folding back said edge portion to 

